/*
 * Copyright (c) 1999 - 2005 NetGroup, Politecnico di Torino (Italy)
 * Copyright (c) 2005 - 2006 CACE Technologies, Davis (California)
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the Politecnico di Torino, CACE Technologies
 * nor the names of its contributors may be used to endorse or promote
 * products derived from this software without specific prior written
 * permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#ifdef _MSC_VER
/*
 * we do not want the warnings about the old deprecated and unsecure CRT functions
 * since these examples can be compiled under *nix as well
 */
#define _CRT_SECURE_NO_WARNINGS
#endif
#include <fstream>
#include <stdio.h>
#include <stdlib.h>
#include <winsock.h>
#define u_int unsigned int
#define u_short unsigned short
#define u_char unsigned char

#define HAVE_REMOTE

#include <pcap.h>

/* 4 bytes IP address */
typedef struct ip_address
{
	u_char byte1;
	u_char byte2;
	u_char byte3;
	u_char byte4;
} ip_address;

// 6 bytes MAC address
typedef struct mac_address
{
	u_char byte1;
	u_char byte2;
	u_char byte3;
	u_char byte4;
	u_char byte5;
	u_char byte6;
} mac_address;

/* IPv4 header */
typedef struct mac_header
{
	mac_address daddr;
	mac_address saddr;
	u_short protoclotype;
};

/* IPv4 header */
typedef struct ip_header
{
	u_char ver_ihl;			// Version (4 bits) + Internet header length (4 bits)
	u_char tos;				// Type of service
	u_short tlen;			// Total length
	u_short identification; // Identification
	u_short flags_fo;		// Flags (3 bits) + Fragment offset (13 bits)
	u_char ttl;				// Time to live
	u_char proto;			// Protocol
	u_short crc;			// Header checksum
	ip_address saddr;		// Source address
	ip_address daddr;		// Destination address
	u_int op_pad;			// Option + Padding
} ip_header;

std::fstream out;

/* prototype of the packet handler */
void packet_handler(u_char *param, const struct pcap_pkthdr *header, const u_char *pkt_data);

int main()
{
	pcap_if_t *alldevs;
	pcap_if_t *d;
	int inum;
	int i = 0;
	pcap_t *adhandle;
	char errbuf[PCAP_ERRBUF_SIZE];
	u_int netmask;

	struct bpf_program fcode;

	char packet_filter[] = "ip and tcp";

	/* Retrieve the device list */
	if (pcap_findalldevs(&alldevs, errbuf) == -1)
	{
		fprintf(stderr, "Error in pcap_findalldevs: %s\n", errbuf);
		exit(1);
	}

	/* Print the list */
	for (d = alldevs; d; d = d->next)
	{
		printf("%d. %s", ++i, d->name);
		if (d->description)
			printf(" (%s)\n", d->description);
		else
			printf(" (No description available)\n");
	}

	if (i == 0)
	{
		printf("\nNo interfaces found! Make sure WinPcap is installed.\n");
		return -1;
	}

	printf("Enter the interface number (1-%d):", i);
	scanf("%d", &inum);

	/* Check if the user specified a valid adapter */
	if (inum < 1 || inum > i)
	{
		printf("\nAdapter number out of range.\n");

		/* Free the device list */
		pcap_freealldevs(alldevs);
		return -1;
	}

	/* Jump to the selected adapter */
	for (d = alldevs, i = 0; i < inum - 1; d = d->next, i++)
		;

	/* Open the adapter */
	if ((adhandle = pcap_open_live(d->name, // name of the device
								   65536,	// portion of the packet to capture.
											// 65536 grants that the whole packet will be captured on all the MACs.
								   1,		// promiscuous mode (nonzero means promiscuous)
								   1000,	// read timeout
								   errbuf	// error buffer
								   )) == NULL)
	{
		fprintf(stderr, "\nUnable to open the adapter. %s is not supported by WinPcap\n");
		/* Free the device list */
		pcap_freealldevs(alldevs);
		return -1;
	}

	/* Check the link layer. We support only Ethernet for simplicity. */
	if (pcap_datalink(adhandle) != DLT_EN10MB)
	{
		fprintf(stderr, "\nThis program works only on Ethernet networks.\n");
		/* Free the device list */
		pcap_freealldevs(alldevs);
		return -1;
	}

	if (d->addresses != NULL)
		/* Retrieve the mask of the first address of the interface */
		netmask = ((struct sockaddr_in *)(d->addresses->netmask))->sin_addr.S_un.S_addr;
	else
		/* If the interface is without addresses we suppose to be in a C class network */
		netmask = 0xffffff;

	// compile the filter
	if (pcap_compile(adhandle, &fcode, packet_filter, 1, netmask) < 0)
	{
		fprintf(stderr, "\nUnable to compile the packet filter. Check the syntax.\n");
		/* Free the device list */
		pcap_freealldevs(alldevs);
		return -1;
	}

	// set the filter
	if (pcap_setfilter(adhandle, &fcode) < 0)
	{
		fprintf(stderr, "\nError setting the filter.\n");
		/* Free the device list */
		pcap_freealldevs(alldevs);
		return -1;
	}

	printf("\nlistening on %s...\n", d->description);
	out.open("MACandIPlog.csv", std::ios::out | std::ios::trunc);
	out << "时间,"
		<< "源 MAC,"
		<< "源 IP,"
		<< "目标 MAC,"
		<< "目标 IP,"
		<< "帧长度"
		<< std::endl;
	/* At this point, we don't need any more the device list. Free it */
	pcap_freealldevs(alldevs);

	/* start the capture */
	pcap_loop(adhandle, 0, packet_handler, NULL);

	return 0;
}

/* Callback function invoked by libpcap for every incoming packet */
void packet_handler(u_char *param, const struct pcap_pkthdr *header, const u_char *pkt_data)
{
	struct tm *ltime;
	char timestr[100];
	mac_header *mh;
	ip_header *ih;
	time_t local_tv_sec;

	/*
	 * unused parameter
	 */
	(VOID)(param);

	/* convert the timestamp to readable format */
	local_tv_sec = header->ts.tv_sec;
	ltime = localtime(&local_tv_sec);
	strftime(timestr, sizeof(timestr), "%Y-%m-%d %H:%M:%S", ltime);

	mh = (mac_header *)(pkt_data);

	/* retireve the position of the ip header */
	ih = (ip_header *)(pkt_data +
					   14); // length of ethernet header

	/* print ip addresses and udp ports */
	char info[60];

	sprintf(info, "%s,%x-%x-%x-%x-%x-%x,%d.%d.%d.%d,%x-%x-%x-%x-%x-%x,%d.%d.%d.%d,%d\n",
			timestr,

			mh->saddr.byte1,
			mh->saddr.byte2,
			mh->saddr.byte3,
			mh->saddr.byte4,
			mh->saddr.byte5,
			mh->saddr.byte6,

			ih->saddr.byte1,
			ih->saddr.byte2,
			ih->saddr.byte3,
			ih->saddr.byte4,

			mh->daddr.byte1,
			mh->daddr.byte2,
			mh->daddr.byte3,
			mh->daddr.byte4,
			mh->daddr.byte5,
			mh->daddr.byte6,

			ih->daddr.byte1,
			ih->daddr.byte2,
			ih->daddr.byte3,
			ih->daddr.byte4,
			header->len);

	out << info;
}
